 In car volt meter reads ZERO with the lights on. |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| Amphicar770 |
 Jul 11 2016, 07:34 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 1,189 Joined: 20-April 10 From: PA, USA Member No.: 11,639 Region Association: MidAtlantic Region 
 |
Good news is that in troubleshooting what I thought might be charging system problem I see 13+ v consistently. But I did make a weird discovery this evening.
The volt meter reads ZERO with the lheadlights on, I know it's inaccurate, but can it be that off?? Again, VM at battery shows 13.x steady. |
   |
 
|
| Mike Bellis |
Jul 11 2016, 08:22 PM
Post
#2
|
|
Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
|
bad ground somewhere and the gauge is drawing ground through the light filament.
|
|
|
|
| Amphicar770 |
Jul 12 2016, 07:42 AM
Post
#3
|
|
Senior Member Group: Members Posts: 1,189 Joined: 20-April 10 From: PA, USA Member No.: 11,639 Region Association: MidAtlantic Region
|
Thanks. I assume that the center gauges share a ground as they connect through common harness. Where does that brown ground wire terminate at the vehicle body?
|
|
|
|
| Spoke |
Jul 12 2016, 07:47 AM
Post
#4
|
|
Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
|
QUOTE(Amphicar770 @ Jul 12 2016, 09:42 AM)  Thanks. I assume that the center gauges share a ground as they connect through common harness. Where does that brown ground wire terminate at the vehicle body? I don't know where the brown ground wire attaches to the chassis. Follow the brown wire from the center console to it's termination on the chassis. You can always measure the voltage on both voltmeter wires by measuring the both wires to chassis. Connect one side of your multimeter to chassis and check the voltages on the back of the center console voltmeter. The brown wire should read 0V and the other wire somewhere around 12-14V. |
|
|
|
| Amphicar770 |
Jul 12 2016, 07:40 PM
Post
#5
|
|
Senior Member Group: Members Posts: 1,189 Joined: 20-April 10 From: PA, USA Member No.: 11,639 Region Association: MidAtlantic Region
|
Well, that turned out to be the easiest repair ever.
Pulled the gauge panel out and quickly saw that the ground wire to the voltmeter was not connected. That is the one the other center gauges piggyback off of so once hooked up I not only stabized the volt meter but I got my temp gauge working. Feels like I am going through sea trials after the engine drop and other work completed. Yesterday I discovered a loose cone screw (thanks Chris from Tangerine for taking my call and diagnosing spot on). A bit annoying given all that I paid the shop to go through everything after I put the engine and all back in. Heck, I noticed immediately the non functioning temp gauge and the weird VM readings. Anyhow, thanks to everyone here, seems like the punch list is diminishing quickly and I will get to enjoy the rest of the summer driving. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 14th May 2024 - 01:45 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.